We have recently moved a client from SBS 2003 to SBS 2008. In the process we changed the domain name. One of the problems I have encountered is that when a user replies to an old email they get a bounce back. I think this is because the old email address refers to the old server (and old domain). The user can workaround by forwarding the message and adding the address from the new address list. This doesn't seem to be affecting external email in.
I have been told that an additional proxy address may need to be adding but can't find a way how in the new 2007 Exchange gui. Can someone help me out.?